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A piece of rough diamond which has the typical non-transparent skin. This rough diamond is easily clarity graded since the skin is completely transparent. Commonly called a glassie. Color can be just as deceptive as clarity in grading.Often the skin of the piece of rough hides the true tinted body color. For example, a rough piece with a greenish skin will most likely end up as a medium to dark yellow.Even in a glassie, color may end up two to three grades lower after finishing.olor can be just as deceptive as clarity in grading. Often the skin of the piece of rough hides the true tinted body color. For example, a rough piece with a greenish skin will most likely end up as a medium to dark yellow.
The unit of hardness given by the test is known as the Vickers Pyramid Number (HV) or Diamond Pyramid Hardness (DPH).The hardness number can be converted into units of pascals, but should not be confused with pressure, which also has units of pascals.The hardness number is determined by the load over the surface area of the indentation and not the area normal to the force, and is therefore not pressure.ickers hardness numbers are reported as xxxHVyy, e.g. 440HV30, or xxxHVyy/zz if duration of force differs from 10 s to 15 s, e.g. 440Hv30/20, where: 1  440 is the hardness number, 2  HV gives the hardness scale (Vickers), 3  30 indicates the load used in kgf.